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<!doctype html>
<title>Serialization of declarations in group rules</title>
<link rel="author" title="Steinar H. Gunderson" href="mailto:sesse@chromium.org">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7850">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="test-sheet"></style>
<script>
function serialize(cssText) {
let [ss] = document.styleSheets;
while (ss.rules.length) {
ss.removeRule(0)
}
ss.insertRule(cssText);
return ss.rules[0].cssText;
}
function assert_unchanged(cssText) {
assert_equals(serialize(cssText), cssText);
}
function assert_becomes(cssText, serializedCssText) {
assert_equals(serialize(cssText), serializedCssText);
}
// Declarations are serialized on one line, rules on two.
test(() => {
assert_unchanged("@media screen {\n div { color: red; background-color: green; }\n}");
assert_unchanged("div {\n @media screen { color: red; background-color: green; }\n}");
});
// Mixed declarations/rules are on two lines.
test(() => {
assert_unchanged("div {\n @supports selector(&) {\n color: red; background-color: green;\n &:hover { color: navy; }\n}\n}");
});
// & {} rules are removed if and only if they are first, and they have no children.
test(() => {
assert_becomes("div { @media screen { & { color: red; } }",
"div {\n @media screen { color: red; }\n}");
assert_becomes("div { @media screen { & { color: red; &:hover { } } }",
"div {\n @media screen {\n & {\n color: red;\n &:hover { }\n}\n}\n}");
assert_becomes("div { @media screen { &.cls { color: red; } & { color: red; }",
"div {\n @media screen {\n &.cls { color: red; }\n & { color: red; }\n}\n}");
assert_becomes("div { @media screen { & { color: red; } & { color: red; }",
"div {\n @media screen {\n color: red;\n & { color: red; }\n}\n}");
assert_becomes("div { @media screen { color: red; & { color: red; }",
"div {\n @media screen {\n color: red;\n & { color: red; }\n}\n}");
assert_becomes("div { @media screen { color: red; & { color: blue; }",
"div {\n @media screen {\n color: red;\n & { color: blue; }\n}\n}");
assert_becomes("div { @media screen { &, p > & { color: blue; }",
"div {\n @media screen {\n &, p > & { color: blue; }\n}\n}");
});
// They are not removed from regular rules.
test(() => {
assert_becomes("div { & { color: red; } }", "div {\n & { color: red; }\n}");
});
// Empty rules (confusingly?) serialize different between style rules
// and conditional group rules.
test(() => {
assert_unchanged("@media screen {\n}");
assert_unchanged("div { }");
assert_unchanged("div {\n @media screen {\n}\n}");
assert_unchanged("@media screen {\n div { }\n}");
});
</script>
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